Thread: 1st Shots from 300BLK AR.

Righteo, the 17.5 grains of H110 pushed the velocity up to 2100 so I'll go another 1/2 grain and recheck. The 2207 did a better job with the sub-sonics, all shots fully extracted and ejected but only a couple managed to catch and feed a new round. The velocity was still under 1050 fps so I can afford to try a bit more powder. My can is due later this week though, so I will not make any more changes until I've tried the current load with the can. As fallback plans, I can ease the gas port out to 0.110", and/or try lighter spring on the JP silent buffer, I think 1911 springs will fit and they are available in several tensions.

Ray.